Measuring Hydrogen Peroxide in Exhaled Breath Condensate in HV

Inclusion Criteria: non-smokers Healthy individuals, free of significant disease. * Given written informed consent prior to participation in the study including all of its procedures. * Comply with the requirements and restrictions listed in the consent form. * Male or female subject aged 18-65 years at screening. * Able to complete the study and all measurements. * Able to read, comprehend, and write at a sufficient level to complete study related materials Exclusion Criteria: Subjects will not be eligible if any of the following apply: - * A history of recreational drug use or allergy which in the opinion of the investigators contra-indicates their participation. * Participation within 3 months in any other study testing a new molecular entity or drug or involving invasive procedures. * Those, in the opinion of the investigator, who may prove non-compliant with study procedures. * History of an upper or lower respiratory infection (including coryza) within 3 weeks of baseline assessments (assessments and entry could be deferred.